Wikipedia clip art commons uses Creative Commons licenses that allow creators to communicate which rights they reserve, and which rights they waive for the benefit of recipients or other creators. Check the license for each clip art to be sure it's in the "public domain" before using it.
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Free Clip Art for Educators - It isn't the greatest clip art, but it's free and legal to use!
Wikipedia clip art commons uses Creative Commons licenses that allow creators to communicate which rights they reserve, and which rights they waive for the benefit of recipients or other creators. Check the license for each clip art to be sure it's in the "public domain" before using it.